Biolage Smoothproof 6-in-1 Professional Hair Serum for Frizzy Hair |Deep Smoothening With Avocado & Grape Seed Oil | Natural & Vegan (100 ml)
Errors identified:
1. "Smoothening" should be corrected to "Smoothing" for correct terminology.
2. Space after the pipe (|) before "Deep Smoothening" for consistency and readability..
3. The volume "(100 ml)" should be moved outside of the parentheses and standardized its format to "100ml" for a cleaner look.

Suggested title:
Biolage Smoothproof 6-in-1 Professional Hair Serum for Frizzy Hair | Deep Smoothing with Avocado & Grape Seed Oil | Natural & Vegan | 100ml